Two vectors A and B have equal magnitudes. The magnitude of (A + B) is ‘n’ times the magnitude of (A – B). The angle between A and B is

\({\rm{co}}{{\rm{s}}^{ - 1}}\left( {\frac{{n - 1}}{{n + 1}}} \right)\)

\({\rm{si}}{{\rm{n}}^{ - 1}}\left( {\frac{{{n^2} - 1}}{{{n^2} + 1}}} \right)\)

\({\rm{si}}{{\rm{n}}^{ - 1}}\left( {\frac{{n - 1}}{{n + 1}}} \right)\)

\({\rm{co}}{{\rm{s}}^{ - 1}}\left( {\frac{{{n^2} - 1}}{{{n^2} + 1}}} \right)\)

Two vectors A and B have equal magnitudes. The magnitude of (A + B) is

1.	Two vectors A and B have equal magnitudes. The magnitude of (A + B) is ‘n’ times the magnitude of (A – B). The angle between A and B is
A.	\({\rm{si}}{{\rm{n}}^{ - 1}}\left( {\frac{{{n^2} - 1}}{{{n^2} + 1}}} \right)\)
B.	\({\rm{si}}{{\rm{n}}^{ - 1}}\left( {\frac{{n - 1}}{{n + 1}}} \right)\)
C.	\({\rm{co}}{{\rm{s}}^{ - 1}}\left( {\frac{{{n^2} - 1}}{{{n^2} + 1}}} \right)\)
D.	\({\rm{co}}{{\rm{s}}^{ - 1}}\left( {\frac{{n - 1}}{{n + 1}}} \right)\)
Answer» D. \({\rm{co}}{{\rm{s}}^{ - 1}}\left( {\frac{{n - 1}}{{n + 1}}} \right)\)